Fuse testing device



Jan. 29, 1935. M. PODELL 1,989,645

FUSE TESTING DEVICE Filed Feb. 6, 1932 2 Sheets-Sheet l HIIIL 1NVENTOR.jaw 1 m m we.

8 BY L ATTORNEYJ' Jan. 29, 1935.

M, PODELL FUSE TESTING DEVICE Filed Feb. 6, 1932 2 Sheets-Sheet 2 INVEN.m M

mos/4% ATTORNEYJ Patented Jan. 29, 1935 v t FnsE- TESTING nnvrcef-Morris Ear H Application February 6, 1932;: s eing Senate 7 me e;(crime-183),

1. UNITED STATES; PATENT 7 invention relates to a new.- and; improved,made ot fibre on othersi itabie; insulating mate fuse testing device; 1i rial. H 1; i One of theobjectsof my: invention is-to produce As shownin F g. 2a, the outer end-oi; the leg, animprcvedf-use-testingdevicecomprisingaplucomprises. additional, memhereor layers; 1c and 5rality of rigid memberszhavingconduoting means 1.:1 These layers, ormembersaxe connected to 5 which; arein cii cuit with a. suitabledetector; such 631C111 other and to members la and Lh-bxmeans as-a glowlamp, or. the-like. 1 of'rivetsfi, I x 1 Another object. of myinventionis-to provide As shown iniFigda theendxofitheelog' 2 adevicewhiehshal'libe simpleand-cheapto mancomprises outside-membersgr layersgd and: 2-1;),

ufacture and whichshallbe ofdurable. construcand an intermediate insert2c. As shown-'in-Fig, 10 tionr Lltheouten end ctthe leg ZyCQmIQ 'iSF S.the-layers Another object of myintention is tcprovide a hand2h.andintizrmediatelaogers Zeqand 21%;. like device-of: this typecomprising pivoted rigid mom insert ismade-of moldable insulating;material hers. v r .o va and ngs e r pr dear he m d ne th 16 Anotherobject. of. my invention is to. providea molding.operationtin;orderztoleave spaceto; ac- 115 device: ofithistypewhiehcan:also-serveasa fusecommcdate the resistance F and. the.deteeting puller. U orindieatinsdeyice 6.,. Ir thiscasethe detecting Other obiects of myinvention willzbeset. forth or indicating-devicefiis ag-lcwlamponneoniiamp; in the following-description and drawings whichbutitmax beam type of lampiv and anyrtype of}.

2c illustrate a preferred. embodiment thereof, it:beindicating devicemay; hehused V In crder to; se go ing understood-that"theabovea general.statement surely. holditheglow lampmposition, and to id of the. objectsofr-my invention is intended to low-fonyariaticns inthe oi glow lamps,a. merely generally explain the same and not to resilient member 5amade-of-ruhbee otiother suit; limit it in any manner. v 1 able materialsoitabiy connectedtame insert 25 j Fig; 1 is2a side elevation-. 1 V 2a.The. indica ing: device-mam be connected to 25 v Fig. 2 isafrontelevations the oircuit'inv any suitable mannen Fig-2a is a. partial;side elevation shotvinga the ASShQWQ-ZiII-EigM 12, nesilient member 5asidecpposite to that whichisillustrated-in Fig. 1. partialls; enc1oses;-and abuts-r the lamp 6. As Fig. 3 is a sectionalviewon the line 3-3, ofehcwndniliigsndandulz,themember Zais provide 39 Fig. 2 7 Y edwithanopening. 12 which is closed bye-sheet v FigAis an inner elevationcfrcne-of thelegs.v of mica or cthei. lightpermeahle materialr 12a Fig.5 is a side View of Fig; 4; sothattheglow oi: thelamg} can be-readilg:de- H Fig (i-ie an inner elevation ofthe. other 1eg -.'v tected; j a

i '7. is aside elevationiof- Fig.. 6,-.the insert TheresistanceRiisconventionally-indicatedrin being'omitted. Fig, 9. resistanceispzxeierabiy at Gal-b011- 35,

Fig; e is a diagrammatic view oi the circuit resistance ofi highival esothat; very small" Our-- Fig-.9 isanelevationshowing. the insert whichrentis-sentithrqughathedamp 6,, when thedeyice is located in:one of thelegs; isusedfrm testingtafuse Ihelamp can be con"- Fig. leis; asideelevation of Fig. 9. nected; to theterminale togbe tested; either in 40Figh ll is a seetionalz view on the. line; LIV- 11 series oninishimt AQIFiE GQDIl BQtiQHniSShDWD 40 oi Fig-iih i i 1 i in the drawings, andthe usepigthehighcarhon I F -p12 a sectional view on the-line 12- -i2resistancemakes it possible-tonsethesamebulb of Fig. 2. I -r Y r oncircuits having; difierentgcommercialvoltages, M s Fig; 13 is a verticalsectionalzview oi one of the such1as- 1'10 -vo1ts-,-22(t voltsaamlgashighz-as: 600 46 .endzeeps. v i t a i. 5 a 1 I H The: device; comprisesalpairoflegs 1- and; 2, Conductors m ane eonnectad mz anypreferablymadeof piecesef insulatingv material suitable: memento-theterminals oi. the glow and: said. legs are connected to each. other by;a lamp and, for this purpose the device be pivot memhemSirwhichcanzbemade of metal: or provided withaa sccketof any eonventionaktme 50anyvcther suitablemateriahanchwhich isacfirivetintowhich the glow lampmay be placed The 50 .likerc'on'struetion. The outer ends; of'said:rigid resistanceR- is-iconnected tc a confine-ting wire legsmay beshaped soithatithe device cam be used T whose inner endris.- cursed-tahcokn-like shape, or-handling aofuse F. v so: that this hQQk-rlikfi;endmhutsthe inner end As shown in Fig; Ltheinner end' of'the 1eg:.1 atthe: 1eg:2j.'. Theeonduotor ai base correspond;- comprises two -legmembers 1a and lb which: are inelyrshanedahoek likefendr which abutsthe-inner end of the leg 1. Metal thimbles 4 and can be connected to theinner ends of the legs 1 and 2. This could be accomplished by means of adrive fit, but I prefer to have some of the rivets 3 extend through themetal thimbles 4 and 5. The metal thimbles 4 and 5 are thus pressedfirmly against the hook-like inner ends of the conductors, in order toinsure firm contact. The outer end of the conducting wire 7a is bent toform afll'oop me'mber fL' and the outer end of the conducting wire B'is'bent to form a loop L. These wires may be uninsulated as they aresecurely held in suitable recesses G provided there for in theinsulating material from; which'the legs of the device are made. Forexample, "and as shown in Fig. 3, the members 'ld andib may be providedwith recessesuinwhich the wire, 8 is located. The loops L and'fLf arefree from insulation so that they can contact-i with' each.

other. The wires "la and 7b are located in a reces's provided theinsert26'. The loops 'L and L pass around the pivot member 9 without touchingFigs; 4'and fishowihow each of the legs is provided with"anj'-arcuate--groove Gin order'to respectively receive" the loops L and L; Said loopsL and L can slide one upon the other with little or no friction; "whil'ebeing maintained in firm rubbing contact so' iasft'o complete thecircuitbetWeentheIn.- Y 7 a As shown m-nig's; 14; Band 8,- the wire 8 passesout of thefleg member 1a," through'jan opening l0. '-S aid reopen-and L:are concentric with the axis about which the rigid legs turn.

Although I have'shown a combination device for testing the fuse and 'forpulling thefuse from its socket, the 'invention" is '-'noti necessarilylimitedto suchi'combinat'ion device.- 'Heretofore it has been customary"to use a'glow lamp to which flexible conductors-were connected in orderto test --a means 'thejuse ofimembers to one of which thedetect'ordevice is connected, presents numerous-advantaged" The innerfend'softheconducting wires may-be considered as "constituting outer conductingterminals, which are enlarged by, the metal members-4 and It is notnecessary "tom ake the device throughout of insulating material althoughis-pr eferred because any part of the device could be-lnade fromco'nducting material, such-' as 1 metal; "by suitably} insulating thecorresponding portion-or portions of the con-,- ducting wires Although Ihave shown the in- 'dicating device ias" being mounted, within one ofthe legs,-"-it would not be-departin'g'frornmy invention-ifsaidindicating device were mounted any manner upon-any of the rigidmembers. Said indicating device could be a buzzer or other acousticdevice al'tho'ugh the use of a glow lamp preferred; since it requiresa-very minute current to 'causejthe' same to glow.

'Of course it woul dfnot be departing from the invention ifa 'pliirality'of detector devices were llti lizedfafid said dtectdr devices could. bemounted onone or on both of the rigid legs.

"' -While I have stated-that the device can be' used 'for'testingyafuse; said device'could obviously be used for testing any circuit byconnecting the wires "8 f and "lb to theternnnals of v the circuit to"be tested. 1

' orfexam'p le, the metal -members '4- and 5 =could have 'serrat'edouter surfaces in order to prevent them" from slipping along the ends ofthe fuses or] buss-bars, etc. Likewise the I members 4 am '5 could bereplaced-by discs having serof the circuit to be tested, said rigidmembers being maderthroughout of insulating material.

'2. A'circuit testing device comprising a pair ofl rigid "member'spivotally connected to each other,,,a,detector device mounted on one ofsaid 'rigidmembers,' conducting wires connected to saidtdetecto'r deviceand respectively mounted on said rigid members, the adjacent ends ofsaid conducting wires comprising portions whi'chare in rubbing contactwith each other, said conducting wires being adapted to complete thecircuit between said detector device and the terminals of the circuit tobe tested;

' -3. A circuit testing device comprising a pair of rigid members, apivot member-pivotally connecting said rigid members, a detector devicemounted on one of said rigid members, wires mountedon said rigidmembers, one of saidwires having the detector device in its circuit, thead'- jacen't'ends of said wires being free from insulation and being inrubbing contact, that portion of each rigid member which is adjacentthe-uninsulated ends of the wires being made from insulating material,s'aid'wires extending to the exterior surfaces of said rigid members.

51. A circuit testing device comprising a pair of ri'gid'members, apivot member pivotally conmeeting said rigid members, a detector devicemounted on'one-of said rigid members, wires located' within said rigid 1members, one of said wires having the detector-devi'ce in its circuit,the adjacent ends of said wires forming loops which are substantiallyconcentric with theaxis of said pivot member and which are in rubbingcontact, said wires extending to the exterior surfaces of said rigidmembers, said rigid members being made of insulating material.

5. A combination fuse extractor and, fuse testing device comprising apair of rigid members, a pivot member pivotally connecting said rigidmembers, the outer ends of said rigid members being shaped to grip afuse, a detector device mounted on the innerend of one of said rigidmembers, wires mounted on said rigid members, one of said wires havingthe detectordevice in its circuit, the adjacent ends of saidwires beingfree from insulation and bein in rubbing contact, that portion of eachrigid member which is adjacent the uninsulated ends of the wires beingmade from insulating material, said wires extending to the exteriorsurfaces of said rigid members.

' 6. A combination fuse extractor and fuse testing device comprising apair of rigid members, a pivot member pivotally connecting said rigidmembers, the outer ends-of said rigid members being shaped togripa fuse,a detector device mounted on-the'inner-end of oneof said rigidmembera'Wiresmounted on said rigid members, one o'f'said wires havingthe detector device in its circuit, the adjacent ends of said wiresbeing free from insulation and being in rubbing-con:- tact, that portionof each rigid'member which is :adjacent the uninsulated ends of thewires being made from insulating material, said Wires extending to theexterior surfaces of said rigid members, the adjacent ends of said wiresforming loops which are substantially concentric with the axis of saidpivot member.

7. A combination fuse extractor and fuse testing device comprising apair of rigid members made of insulating material, a pivot memberpivotally connecting said rigid members, the outer ends of said rigidmembers being shaped to grip a fuse, a detector device associated withone of said rigid members, wires located within said rigid members, oneof said wires having the detector device in its circuit, the adjacentends of said wires being in rubbing contact, said wires extending to theexterior surfaces of said rigid members, and metal members located atthe inner ends of said rigid members and respectively contacting withsaid wires.

8. A circuit-testing device comprising a pair of rigid members, a pivotconnecting said rigid members, a detector device mounted on one of saidrigid members, conducting wires connected to said detector device andrespectively mounted within said rigid members so as to be turnable inunison therewith, the adjacent ends of said conducting wires comprisingportions which are in rubbing contact with each other, said rigidmembers having recesses in which said adjacent ends are located, saidadjacent ends being concentric with said pivot member, said conductingwires being adapted to complete the circuit between said detector deviceand the terminals of the circuit to be tested.

9. A combination fuse extractor and fuse-testing device comprising afirst rigid leg and a second rigid leg, a pivot member connecting saidrigid legs, each of said legs comprising an inner portion, each of saidlegs also comprising an outer portion, said outer portions being adaptedto grip the fuse, the inner portion of the first leg comprising aplurality of rigid insulating members between which a wire is located,the outer portion of the first leg comprising said rigid insulatingmembers, and also additional rigid insulating members between which thefirst mentioned rigid members are located, the inner portion of thesecond leg comprising spaced rigid members made of insulating materialand having an intermediate insert in which there is located a detectordevice, and a second conducting wire which is connected to said detectordevice, the

ends of said wires which are close to said pivot member being in rubbingcontact with each other and being located in recesses which are providedin the respective legs, the inner portion of the first leg being locatedbetween the spaced rigid members of the second leg adjacent said pivotmember.

10. A combination fuse extractor and fusetesting device comprising afirst rigid leg and a second rigid leg, a pivot member connecting. saidrigid legs, said legs being made of insulating material, each of saidlegs comprising an inner portion, each of said legs also comprising anouter portion, said outer portions being adapted to grip the fuse, theinner portion of the second leg having outer spaced and rigid members,said spaced rigid members having an insert located between them, adetector device and a wire mounted in said insert, the first rigid legbeing located between said spaced rigid members adjacent the pivotmember, the first rigid leg also having a wire located therein, the endsof said wires which are close to said pivot member being in rubbingcontact with each other and being located in recesses which are providedin the respective legs.

11. A circuit-testing device comprising a first rigid member and asecond rigid member, said rigid members being made of insulatingmaterial, a pivot connecting said rigid members, said rigid membershaving recesses around said pivot, said recesses registering with eachother, said rigid members having conducting members at their outer ends,the first rigid member having a detector device mounted thereon andconnected to the respective outer metal member, said outer conductingmembers being connected with each other through said detector device byconducting means parts of which are located within said recesses.

12. A circuit-testing device comprising a first rigid member and asecond rigid member, said members being connected by a pivot, saidmembers being made of insulating material on both sides of said pivot,said rigid members having conducting members on their outer ends, thefirst rigid member having a detector device mounted thereon andconnected to the respective outer conducting member, said outerconducting members being connected with each other and through saiddetector device by conducting means a part of which is exposed only atthe adjacent surfaces of said rigid members adjacent said pivot pin,said conducting means being enclosed by said rigid members.

13. In an electric fuse tester, a pair of compassing legs of insulatingmaterial having pivoted connection with each other, a pair of test pinssecured to the free end of said legs, a neon tube located in one leg andbeing visible through an aperture therein, a resistance unit, and con- Iducting means in said legs for connecting said tube in circuit with saidpins and said resistance unit.

MORRIS PODELL.

